Monday, May 21, 2007
Mon-Day 2
TEST for both Honors and Regents classes tomorrow/Tuesday.
Honors: we finished our electrochem/redox unit by explaining the electrolytic cell, which can be used for electrolysis of molten salts, salt solutions, or water, and also for electroplating of precious metals onto cheaper metal items.
Electrolysis is also used for purification of metal ores though we didn't do an example of that (so that specific example won't be on the test).
One definition/convention that I forgot to mention is that, in an ELECTROLYTIC CELL, the cathode is labelled with a negative sign (opposite of what the cathode is labelled in a VOLTAIC (spontaneous) cell) and the anode is given the positive label (again, opposite of the sign of the anode in a VOLTAIC cell). HOWEVER, "an ox" (oxidation occurs at the anode metal bar) and "red cat" (reduction occurs at the cathode metal bar) still applies and is the same for ANY electrochemical cell.
I will post another Regents for you to preview for Wednesday's class, which is when we begin formal Regents review. Scrutinize the test and CIRCLE ANY QUESTION that you do not readily and easily know how to do...we will have time for ONLY these questions DURING CLASS; the rest you must do that night for hw or with me at extra help. You will hand in your written work for each Regents.
Bonus Regents may begin later this week IF lab folders are perfect AND IF ALL fourth quarter tests are 100% corrected. YOU MUST know that material inside and out or you are wasting your time AND my time with these practice exams.
Regents: we finished our electrochem/redox unit by explaining the electrolytic cell, which can be used for electrolysis of molten salts, salt solutions, or water, and also for electroplating of precious metals onto cheaper metal items.
Electrolysis is also used for purification of metal ores though we didn't do an example of that (so that specific example won't be on the test).
I will post another Regents for you to preview for Wednesday's class, which is when we begin formal Regents review. Scrutinize the test and CIRCLE ANY QUESTION that you do not readily and easily know how to do...we will have time for ONLY these questions DURING CLASS; the rest you must do that night for hw or with me at extra help. You will hand in your written work for each Regents.
Honors: we finished our electrochem/redox unit by explaining the electrolytic cell, which can be used for electrolysis of molten salts, salt solutions, or water, and also for electroplating of precious metals onto cheaper metal items.
Electrolysis is also used for purification of metal ores though we didn't do an example of that (so that specific example won't be on the test).
One definition/convention that I forgot to mention is that, in an ELECTROLYTIC CELL, the cathode is labelled with a negative sign (opposite of what the cathode is labelled in a VOLTAIC (spontaneous) cell) and the anode is given the positive label (again, opposite of the sign of the anode in a VOLTAIC cell). HOWEVER, "an ox" (oxidation occurs at the anode metal bar) and "red cat" (reduction occurs at the cathode metal bar) still applies and is the same for ANY electrochemical cell.
I will post another Regents for you to preview for Wednesday's class, which is when we begin formal Regents review. Scrutinize the test and CIRCLE ANY QUESTION that you do not readily and easily know how to do...we will have time for ONLY these questions DURING CLASS; the rest you must do that night for hw or with me at extra help. You will hand in your written work for each Regents.
Bonus Regents may begin later this week IF lab folders are perfect AND IF ALL fourth quarter tests are 100% corrected. YOU MUST know that material inside and out or you are wasting your time AND my time with these practice exams.
Regents: we finished our electrochem/redox unit by explaining the electrolytic cell, which can be used for electrolysis of molten salts, salt solutions, or water, and also for electroplating of precious metals onto cheaper metal items.
Electrolysis is also used for purification of metal ores though we didn't do an example of that (so that specific example won't be on the test).
I will post another Regents for you to preview for Wednesday's class, which is when we begin formal Regents review. Scrutinize the test and CIRCLE ANY QUESTION that you do not readily and easily know how to do...we will have time for ONLY these questions DURING CLASS; the rest you must do that night for hw or with me at extra help. You will hand in your written work for each Regents.
# posted by C @ 2:15 PM 
